Abstract
This paper presents a study on parameter variations of an induction machine for integrated starter alternator (ISA) with respect to stator frequency, magnetisation and slip frequency. No-load and stand-still tests are conducted under variable-frequency and variable-voltage instead of conventional constant frequency tests, using a PWM inverter in order to obtain the variations of rotor resistance, rotor leakage inductance, magnetising inductance and core-loss. In addition to these tests, impressed stator voltage and impressed stator current tests are carried out. Theory, analysis and results of the above parameter determination methods are presented. The parameter variations obtained from the variable-frequency variable-voltage no-load and stand-still tests are compared with conventional tests parameters as well as the parameters obtained from impressed stator voltage and stator current tests. The parameter variations found in this study can be used to obtain a detailed model that predicts the behaviour of the induction machine over wide speed range and under dynamic loading conditions more precisely than the conventional constant parameter model.
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